People still, in 2006, seem to think that Linux has a problem with audio, video, ripping, compressing, converting, etc. No, people, no. For videos/dvd playing/dvd encoding, I use MPlayer. It's a command line player (don't freak out just yet), and it plays everything I can throw at it.
To play the first track on a DVD:
mplayer dvd://1Tricky eh.
To encode a DVD, you can use mencoder. There are tonnes of options that you can select, so I've put my "ripdvd" script on the web for people to use. Of course children, you can only use it to back up DVDs that you own.
As for music, there are tonnes of options. I use XMMS (which is basically designed to look and work as similarly as Winamp as possible.)
I'm going to post links to related packages as comments below.
Don't forget as well, that most of the animation companies use Linux now. Dreamworks, Pixar, Disney to name but a few.
- MPlayer and Mencoder - **the** best (IMO) movie player and encoder out there.
- XMMS - Winamp look-and-work-alike
- Amarok - iTunes-like music player and manager
- Real Player for Linux
- Ardour - professional-grade multitrack/multichannel hard-disk recording for Linux
- Sound Tracker - An Octomed-like tracker
- Audacity - audio editor
- Cinelerra - video editing software
- Povray - 3D rendering software
- Blender - "software for 3D modeling, animation, rendering, post-production, interactive creation and playback."